Office (OOXML) malware analysis — malicious · d8043eff4ee98397

MALICIOUS

Office (OOXML)

41.9 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300

MD5: e7e111cc491434792da7bb08cc1e795a SHA-1: bd4533e72d4afce6828e59b9a3fba9f1c28104ce SHA-256: d8043eff4ee98397b41b9de71671eb796f8a4b18f2f6913a31e6f0194c4c5723

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1218.011 System Binary Proxy Execution: Rundll32 T1059.003 Windows Command Shell

The file contains a Workbook_Open macro that references PowerShell and cmd.exe. The macro also uses GetObject to launch Win32_Process, indicating an attempt to execute arbitrary commands. The presence of a Base64 decoding function suggests obfuscation of malicious code, likely to download and execute a second-stage payload.

Heuristics 6

PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE

VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
GetObject call high OLE_VBA_GETOBJ

GetObject call
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
VBA project inside OOXML medium OOXML_VBA

Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `9a4b8c1d13036afcff54639584a98abd396110928b26aec4bf4146b40dfb283a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35555 bytes
`vbaProject_00.bin` `ce0aaba74fa008a9337dc764bf150ddf3079f1035c18ea86ac192472a5c1eda8`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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